Bug 1484526 - Increase timeout for webconsole stackframe test r=nchevobbe

Ups the timeout for a test that naturally takes a long time to pass on CI

Differential Revision: https://phabricator.services.mozilla.com/D11185

--HG--
extra : moz-landing-system : lando

devtools/client/webconsole/test/mochitest/browser_jsterm_autocomplete_in_debugger_stackframe.js

@@ -17,6 +17,8 @@ Services.scriptloader.loadSubScript(
 const TEST_URI = "http://example.com/browser/devtools/client/webconsole/" +
                  "test/mochitest/test-autocomplete-in-stackframe.html";
 
+requestLongerTimeout(20);
+
 add_task(async function() {
   // Run test with legacy JsTerm
   await pushPref("devtools.webconsole.jsterm.codeMirror", false);